{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## sigmoid 函数"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "import numpy as np\n",
    "import matplotlib.pyplot as plt"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "def sigmoid(t):\n",
    "    return 1. / (1. + np.exp(-t))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "data": {
      "text/plain": "<Figure size 432x288 with 1 Axes>",
      "image/png": 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\n"
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "x = np.linspace(-10, 10, 500)\n",
    "\n",
    "plt.plot(x, sigmoid(x))\n",
    "plt.show()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "import numpy as np\n",
    "import matplotlib.pyplot as plt"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [],
   "source": [
    "def sigmod(t):\n",
    "    return"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.6.5"
  },
  "toc": {
   "base_numbering": 1,
   "nav_menu": {},
   "number_sections": true,
   "sideBar": true,
   "skip_h1_title": false,
   "title_cell": "Table of Contents",
   "title_sidebar": "Contents",
   "toc_cell": false,
   "toc_position": {},
   "toc_section_display": true,
   "toc_window_display": false
  }
 },
 "nbformat": 4,
 "nbformat_minor": 2
}